// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_VIEWS_CONTROLS_SLIDE_OUT_VIEW_H_
#define UI_VIEWS_CONTROLS_SLIDE_OUT_VIEW_H_

#include "base/macros.h"
#include "ui/compositor/layer_animation_observer.h"
#include "ui/views/view.h"
#include "ui/views/views_export.h"

namespace views {

// A View that can be closed by a slide-out touch gesture.
class VIEWS_EXPORT SlideOutView : public views::View,
                                  public ui::ImplicitAnimationObserver {
public:
    SlideOutView();
    ~SlideOutView() override;

protected:
    // Called when user intends to close the View by sliding it out.
    virtual void OnSlideOut() = 0;

    // Overridden from views::View.
    void OnGestureEvent(ui::GestureEvent* event) override;

private:
    enum SlideDirection {
        SLIDE_LEFT,
        SLIDE_RIGHT,
    };

    // Restores the transform and opacity of the view.
    void RestoreVisualState();

    // Slides the view out and closes it after the animation.
    void SlideOutAndClose(SlideDirection direction);

    // Overridden from ImplicitAnimationObserver.
    void OnImplicitAnimationsCompleted() override;

    float gesture_scroll_amount_;

    DISALLOW_COPY_AND_ASSIGN(SlideOutView);
};

} // namespace views

#endif // UI_VIEWS_CONTROLS_SLIDE_OUT_VIEW_H_
